On the 6th of January, 1600, Henry IV. gave his ambassador, Brulart de Sillery, powers to conclude at Florence his marriage with Mary de’ Medici, daughter of Francis I. de’ Medici, grand duke of Tuscany, and Joan, archduchess of Austria and niece of the grand duke Ferdinand I. de’ Medici, who had often rendered Henry IV. pecuniary services dearly paid for. As early as the year 1592 there had been something said about this project of alliance; it was resumed and carried out on the 5th of October, 1600, at Florence, with lavish magnificence. Mary embarked at Leghorn on the 17th, with a fleet of seventeen galleys; that of which she was aboard, the _General_, was all covered over with jewels, inside and out; she arrived at Marseilles on the 3d of November, and at Lyons on the 2nd of December, where she waited till the 9th for the king, who was detained by the war with Savoy. He entered her chamber in the middle of the night, booted and armed, and next day, in the cathedral church of St. John, re-celebrated his marriage, more rich in wealth than it was destined to be in happiness. Henry IV. seemed to have attained in his public and in his domestic life the pinnacle of earthly fortune and ambition. He was, at one and the same time, Catholic king and the head of the Protestant polity in Europe, accepted by the Catholics as the best, the only possible, king for them in France. He was at peace with all Europe, except one petty prince, the duke of Savoy, Charles Emmanuel I., from whom he demanded back the Marquisate of Saluzzo or a territorial compensation in France itself on the French side of the Alps. After a short campaign, and thanks to Rosny’s ordnance, he obtained what he desired, and by a treaty of January 17, 1601, he added to French territory La Bresse, Le Bugey, the district of Gex and the citadel of Bourg, which still held out after the capture of the town. He was more and more dear to France, to which he had restored peace at home as well as abroad, and industrial, commercial, financial, monumental, and scientific prosperity, until lately unknown. Sully covered the country with roads, bridges, canals, buildings and works of public utility. The conspiracy of his old companion in arms, Gontaut de Biron, proved to him, however, that he was not at the end of his political dangers, and the letters he caused to be issued (September, 1603) for the return of the Jesuits did not save him from the attacks of religious fanaticism.